diff --git a/README.md b/README.md
index af754e8..1e9272a 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,8 @@ Keycloak extension for creating multi-tenant IAM for B2B SaaS applications.
 
 ## License
 
-This project is licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0). You can find the full text of the license in the [LICENSE](LICENSE) file.
+This project is licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0). You can find the full text of the license in
+the [LICENSE](LICENSE) file.
 
 ## Features
 
@@ -64,7 +65,7 @@ Now go to `Realm Settings` > `Login` and turn on `Verify email` as only users wi
 
 Each new user will be prompted to review pending invitations, if any, and/or create a new tenant if there is no invitation, or they do not accept any of them.
 If they accept the invitation, they can still create another tenant later using the [API](#api).
-Note that tenant creation through the API can be restricted to users with a specified client role by setting the `TENANT_CREATION_ROLE` environment variable.
+Note that tenant creation through the API can be restricted to users with a specified client role by setting the `requiredRoleForTenantCreation` realm attribute.
 Users who is a member of more than one tenant will be prompted to select an active tenant when they log in.
 
 ### Token Claims
@@ -88,33 +89,43 @@ In the same way, you can set up `All tenants` mapper that will add to the token
 
 ### IDP and SSO Integration
 
-In a multi-tenant application, it's often necessary for tenants to use their own Identity Provider (IDP). 
+In a multi-tenant application, it's often necessary for tenants to use their own Identity Provider (IDP).
 While Keycloak supports identity brokering, it may not be fully compatible with the multi-tenant model introduced by this extension.
 
-One of the issues arises from the lack of a connection between tenants and their respective IDPs. 
-This prevents the onboarding of users during their initial login using the IDP, since if users haven't been pre-created and added to the required tenant, 
-the created users will be tenantless and asked to create a new tenant. 
-To address this issue, this extension introduces the concept of `tenant-specific IDPs` and an additional authenticator that facilitates the creation of required memberships.
+One of the issues arises from the lack of a connection between tenants and their respective IDPs.
+This prevents the onboarding of users during their initial login using the IDP, since if users haven't been pre-created and added to the required tenant,
+the created users will be tenantless and asked to create a new tenant.
+To address this issue, this extension introduces the concept of `tenant-specific IDPs` and an additional authenticator that facilitates the creation of required
+memberships.
 
-To configure an IDP as tenant-specific, tenants' IDs should be added to the `multi-tenancy.tenants` configuration attribute of the IDP as a **comma-separated list**. 
+To configure an IDP as tenant-specific, tenants' IDs should be added to the `multi-tenancy.tenants` configuration attribute of the IDP as a **comma-separated
+list**.
 This can be achieved using the standard [Keycloak REST API](https://www.keycloak.org/docs-api/23.0.1/rest-api/index.html#_identity_providers).
 
 > **_Note_**
-> - _With tenant-specific IDP configuration, the IDP limits access to only the tenants listed in the configuration. 
-> If a user logs in with the IDP but isn't a member of any of these specified tenants, and automatic membership creation isn't configured, an error will occur._
-> - _IDPs that lack the `multi-tenancy.tenants` configuration attribute are considered public. 
-> These public IDPs grant access to any tenants for users who are members of those tenants. This ensures compatibility with existing setups and doesn't disrupt previous configurations._
-
-To automatically add users as members of all the configured tenants during their initial login, the `Create tenant membership` authenticator should be added to the IDP's `first login flow`. 
-Alternatively, this authenticator can be added to the `post-login flow`, allowing memberships to be created even for tenants added to the IDP after the user has already been onboarded.
+> - _With tenant-specific IDP configuration, the IDP limits access to only the tenants listed in the configuration.
+    > If a user logs in with the IDP but isn't a member of any of these specified tenants, and automatic membership creation isn't configured, an error will
+    occur._
+> - _IDPs that lack the `multi-tenancy.tenants` configuration attribute are considered public.
+    > These public IDPs grant access to any tenants for users who are members of those tenants. This ensures compatibility with existing setups and doesn't
+    disrupt previous configurations._
+
+To automatically add users as members of all the configured tenants during their initial login, the `Create tenant membership` authenticator should be added to
+the IDP's `first login flow`.
+Alternatively, this authenticator can be added to the `post-login flow`, allowing memberships to be created even for tenants added to the IDP after the user has
+already been onboarded.
 Any memberships created by this authenticator will automatically have the default `tenant-user` role assigned to them.
 
 In order to enhance privacy and avoid listing all tenant-specific IDPs on the login page, a custom `Login with SSO` authenticator has been introduced.
 It can be added as an alternative to the password and other authentication methods in the `browser flow`.
-This will either include a `Try Another Way` link on the login page or, if it already exists, add an additional `Single Sign-on (SSO)` option to the available login methods.
-If the user selects `Single Sign-on (SSO)`, they will be prompted to enter an IDP alias and then redirected to the corresponding IDP login page if a match is found.
+This will either include a `Try Another Way` link on the login page or, if it already exists, add an additional `Single Sign-on (SSO)` option to the available
+login methods.
+If the user selects `Single Sign-on (SSO)`, they will be prompted to enter an IDP alias and then redirected to the corresponding IDP login page if a match is
+found.
+
+If you'd like to include a direct link to `Single Sign-On (SSO)` on the login page, you can achieve this by modifying the login page template and adding the
+following code:
 
-If you'd like to include a direct link to `Single Sign-On (SSO)` on the login page, you can achieve this by modifying the login page template and adding the following code:
 ```html
 
 <script type="text/javascript">
diff --git a/src/main/java/dev/sultanov/keycloak/multitenancy/resource/TenantsResource.java b/src/main/java/dev/sultanov/keycloak/multitenancy/resource/TenantsResource.java
index 27ebf61..e3282e8 100644
--- a/src/main/java/dev/sultanov/keycloak/multitenancy/resource/TenantsResource.java
+++ b/src/main/java/dev/sultanov/keycloak/multitenancy/resource/TenantsResource.java
@@ -2,7 +2,6 @@
 
 import dev.sultanov.keycloak.multitenancy.model.TenantModel;
 import dev.sultanov.keycloak.multitenancy.resource.representation.TenantRepresentation;
-import dev.sultanov.keycloak.multitenancy.util.Environment;
 import jakarta.ws.rs.Consumes;
 import jakarta.ws.rs.GET;
 import jakarta.ws.rs.NotAuthorizedException;
@@ -26,7 +25,6 @@
 import org.keycloak.events.admin.OperationType;
 import org.keycloak.models.Constants;
 import org.keycloak.models.KeycloakSession;
-import org.keycloak.models.RoleModel;
 
 public class TenantsResource extends AbstractAdminResource<TenantAdminAuth> {
 
@@ -41,9 +39,9 @@ public TenantsResource(KeycloakSession session) {
     @APIResponse(responseCode = "201", description = "Created")
     public Response createTenant(@RequestBody(required = true) TenantRepresentation request) {
 
-        var requiredRole = Environment.getVariable("TENANT_CREATION_ROLE");
-        if (requiredRole.isPresent() && !auth.hasAppRole(auth.getClient(), requiredRole.get())) {
-            throw new NotAuthorizedException(String.format("Missing required role for tenant creation: %s", requiredRole.get()));
+        var requiredRole = realm.getAttribute("requiredRoleForTenantCreation");
+        if (requiredRole != null && !auth.hasAppRole(auth.getClient(), requiredRole)) {
+            throw new NotAuthorizedException(String.format("Missing required role for tenant creation: %s", requiredRole));
         }
 
         TenantModel model = tenantProvider.createTenant(realm, request.getName(), auth.getUser());
diff --git a/src/main/java/dev/sultanov/keycloak/multitenancy/util/Environment.java b/src/main/java/dev/sultanov/keycloak/multitenancy/util/Environment.java
deleted file mode 100644
index ee1540d..0000000
--- a/src/main/java/dev/sultanov/keycloak/multitenancy/util/Environment.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package dev.sultanov.keycloak.multitenancy.util;
-
-import java.util.Optional;
-
-public class Environment {
-
-    private Environment() {
-        throw new AssertionError("Not for instantiation");
-    }
-
-    public static Optional<String> getVariable(String name) {
-        return Optional.ofNullable(System.getenv(name));
-    }
-}
diff --git a/src/test/java/dev/sultanov/keycloak/multitenancy/TenantCreationRbacIntegrationTest.java b/src/test/java/dev/sultanov/keycloak/multitenancy/TenantCreationRbacIntegrationTest.java
index 52ac3e1..a5902b5 100644
--- a/src/test/java/dev/sultanov/keycloak/multitenancy/TenantCreationRbacIntegrationTest.java
+++ b/src/test/java/dev/sultanov/keycloak/multitenancy/TenantCreationRbacIntegrationTest.java
@@ -5,79 +5,95 @@
 import dev.sultanov.keycloak.multitenancy.resource.representation.TenantRepresentation;
 import dev.sultanov.keycloak.multitenancy.support.BaseIntegrationTest;
 import dev.sultanov.keycloak.multitenancy.support.actor.KeycloakAdminCli;
+import java.util.HashMap;
 import java.util.Map;
 import java.util.UUID;
-import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.keycloak.admin.client.CreatedResponseUtil;
 
 public class TenantCreationRbacIntegrationTest extends BaseIntegrationTest {
 
-    @Nested
-    class WithRequiredRole {
+    private static final String ATTRIBUTE_NAME = "requiredRoleForTenantCreation";
+    private static final String REQUIRED_ROLE = "create-tenant";
 
-        private static final String TENANT_CREATION_ROLE = "create-tenant";
+    private KeycloakAdminCli keycloakAdminClient;
 
-        @Test
-        void runTests() {
-            withCustomKeycloak(Map.of("TENANT_CREATION_ROLE", TENANT_CREATION_ROLE), () -> {
-                assertThatCanCreateTenantWhenRequiredRoleIsPresent();
-                assertThatCannotCreateTenantWhenRequiredRoleIsMissing();
-            });
+    @BeforeEach
+    void setUp() {
+        keycloakAdminClient = KeycloakAdminCli.forMainRealm();
+    }
+
+    @Test
+    void user_shouldCreateTenant_whenRoleIsRequiredAndPresent() {
+        // given
+        addRealmAttribute(ATTRIBUTE_NAME, REQUIRED_ROLE);
+        var user = keycloakAdminClient.createVerifiedUser();
+        user.createTenant(); // complete "create-tenant" required action
+        keycloakAdminClient.assignClientRoleToUser(user.getClientId(), REQUIRED_ROLE, user.getUserId());
+
+        // when
+        var tenantRepresentation = new TenantRepresentation();
+        tenantRepresentation.setName("Tenant-" + UUID.randomUUID());
+        try (var response = user.tenantsResource().createTenant(tenantRepresentation)) {
+
+            // then
+            assertThat(CreatedResponseUtil.getCreatedId(response)).isNotNull();
+        } finally {
+            removeRealmAttribute(ATTRIBUTE_NAME);
         }
+    }
 
-        void assertThatCanCreateTenantWhenRequiredRoleIsPresent() {
-            // given
-            var keycloakAdminClient = KeycloakAdminCli.forMainRealm();
-            var user = keycloakAdminClient.createVerifiedUser();
-            user.createTenant(); // complete "create-tenant" required action
-            keycloakAdminClient.assignClientRoleToUser(user.getClientId(), TENANT_CREATION_ROLE, user.getUserId());
-
-            // when
-            var tenantRepresentation = new TenantRepresentation();
-            tenantRepresentation.setName("Tenant-" + UUID.randomUUID());
-            try (var response = user.tenantsResource().createTenant(tenantRepresentation)) {
-
-                // then
-                assertThat(CreatedResponseUtil.getCreatedId(response)).isNotNull();
-            }
+    @Test
+    void user_shouldFailToCreateTenant_whenRoleIsRequiredButMissing() {
+        // given
+        addRealmAttribute(ATTRIBUTE_NAME, REQUIRED_ROLE);
+        var user = keycloakAdminClient.createVerifiedUser();
+        user.createTenant(); // complete "create-tenant" required action
+
+        // when
+        var tenantRepresentation = new TenantRepresentation();
+        tenantRepresentation.setName("Tenant-" + UUID.randomUUID());
+        try (var response = user.tenantsResource().createTenant(tenantRepresentation)) {
+
+            // then
+            assertThat(response.getStatus()).isEqualTo(401);
+        } finally {
+            removeRealmAttribute(ATTRIBUTE_NAME);
         }
+    }
 
-        void assertThatCannotCreateTenantWhenRequiredRoleIsMissing() {
-            // given
-            var keycloakAdminClient = KeycloakAdminCli.forMainRealm();
-            var user = keycloakAdminClient.createVerifiedUser();
-            user.createTenant(); // complete "create-tenant" required action
+    @Test
+    void user_shouldCreateTenant_whenRoleIsNotRequired() {
+        // given
+        var user = keycloakAdminClient.createVerifiedUser();
+        user.createTenant(); // complete "create-tenant" required action
 
-            // when
-            var tenantRepresentation = new TenantRepresentation();
-            tenantRepresentation.setName("Tenant-" + UUID.randomUUID());
-            try (var response = user.tenantsResource().createTenant(tenantRepresentation)) {
+        // when
+        var tenantRepresentation = new TenantRepresentation();
+        tenantRepresentation.setName("Tenant-" + UUID.randomUUID());
+        try (var response = user.tenantsResource().createTenant(tenantRepresentation)) {
 
-                // then
-                assertThat(response.getStatus()).isEqualTo(401);
-            }
+            // then
+            assertThat(CreatedResponseUtil.getCreatedId(response)).isNotNull();
         }
     }
 
-    @Nested
-    class WithoutRequiredRole {
+    private void addRealmAttribute(String key, String value) {
+        var realmRepresentation = keycloakAdminClient.getRealmResource().toRepresentation();
+        var attributes = new HashMap<>(realmRepresentation.getAttributesOrEmpty());
+        attributes.put(key, value);
+        realmRepresentation.setAttributes(attributes);
 
-        @Test
-        void user_shouldCreateTenant_whenRoleIsNotRequired() {
-            // given
-            var keycloakAdminClient = KeycloakAdminCli.forMainRealm();
-            var user = keycloakAdminClient.createVerifiedUser();
-            user.createTenant(); // complete "create-tenant" required action
+        keycloakAdminClient.getRealmResource().update(realmRepresentation);
+    }
 
-            // when
-            var tenantRepresentation = new TenantRepresentation();
-            tenantRepresentation.setName("Tenant-" + UUID.randomUUID());
-            try (var response = user.tenantsResource().createTenant(tenantRepresentation)) {
+    private void removeRealmAttribute(String key) {
+        var realmRepresentation = keycloakAdminClient.getRealmResource().toRepresentation();
+        Map<String, String> attributes = new HashMap<>(realmRepresentation.getAttributesOrEmpty());
+        attributes.remove(key);
+        realmRepresentation.setAttributes(attributes);
 
-                // then
-                assertThat(CreatedResponseUtil.getCreatedId(response)).isNotNull();
-            }
-        }
+        keycloakAdminClient.getRealmResource().update(realmRepresentation);
     }
 }
diff --git a/src/test/java/dev/sultanov/keycloak/multitenancy/support/BaseIntegrationTest.java b/src/test/java/dev/sultanov/keycloak/multitenancy/support/BaseIntegrationTest.java
index 3bc45b0..c3dacf1 100644
--- a/src/test/java/dev/sultanov/keycloak/multitenancy/support/BaseIntegrationTest.java
+++ b/src/test/java/dev/sultanov/keycloak/multitenancy/support/BaseIntegrationTest.java
@@ -5,7 +5,6 @@
 import dasniko.testcontainers.keycloak.KeycloakContainer;
 import jakarta.ws.rs.client.Client;
 import jakarta.ws.rs.client.ClientBuilder;
-import java.util.Map;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.testcontainers.containers.GenericContainer;
@@ -57,26 +56,4 @@ static void afterAll() {
         playwright.close();
         IntegrationTestContextHolder.clearContext();
     }
-
-    protected void withCustomKeycloak(Map<String, String> envVars, Runnable runnable) {
-        var currentContext = IntegrationTestContextHolder.getContext();
-        var customKeycloak = new KeycloakContainer(keycloak.getDockerImageName())
-                .withNetwork(keycloak.getNetwork())
-                .withAccessToHost(true)
-                .withRealmImportFiles("/realm-export.json", "/idp-realm-export.json")
-                .withProviderClassesFrom("target/classes")
-                .withNetworkAliases("keycloak-custom")
-                .withEnv(envVars);
-
-        try {
-            customKeycloak.start();
-            var updatedContext = new IntegrationTestContext(currentContext.httpClient(), currentContext.browser(), customKeycloak.getAuthServerUrl(),
-                    currentContext.mailhogUrl());
-            IntegrationTestContextHolder.setContext(updatedContext);
-            runnable.run();
-        } finally {
-            keycloak.stop();
-            IntegrationTestContextHolder.setContext(currentContext);
-        }
-    }
 }